diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index f776c75..6de222f 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -2821,7 +2821,7 @@ static int mov_write_packet_internal(AVFormatContext *s, AVPacket *pkt)

     if (!size) return 0; /* Discard 0 sized packets */

-    if (trk->entry)
+    if (trk->entry && 0)
         frag_duration = av_rescale_q(pkt->dts - trk->cluster[0].dts,
                                      s->streams[pkt->stream_index]->time_base,
                                      AV_TIME_BASE_Q);